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DTSTART:20151025T030000
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DTSTAMP:20260524T130713Z
DESCRIPTION:Accurate knowledge of trace metal speciation is important for m
 any reasons. First\, it greatly affects bioavailability and hence uptake/t
 oxicity in organisms. Second\, the speciation determines the mobility of t
 he trace metal in the environment. Our mission is to combine state-of-the-
 art characterization methods (such as synchrotron-based X-ray methods) wit
 h geochemical modelling and toxicity studies to arrive at improved underst
 anding of trace metal behavior in soils. Vanadium will be taken as an exam
 ple of a trace metal for which speciation is key to understanding both the
  chemical reactivity and biological uptake. Our V K-edge XANES studies sho
 w that vanadium added to soils is recovered mostly as vanadate(V) except i
 n acid organic soils in which vanadyl(IV) predominates. The solubility of 
 vanadate(V) therefore turns out to be of major importance for bioavailabil
 ity\, as shown by toxicity studies for barley. Another example is provided
  concerning how ZVI stabilization affects the speciation and solubility of
  arsenic and copper.\nFor phosphorus in agricultural soils\, the speciatio
 n is rather complex and includes a variety of inorganic P forms as well as
  organic P. The use of P K-edge XANES spectroscopy has provided us with a 
 tool that allows assessments of how the speciation changes in response to 
 long-term fertilization as well as with depth within a soil profile. From 
 these studies it is clear that adsorbed Al and Fe phases play a crucial ro
 le in determining the P dynamics over a time scale from years to decades\;
  however\, in some cases Ca-P phases may also form after heavy fertilizati
 on\, at least temporarily. Moreover these studies show the dramatic change
 s that occur in P speciation during soil development\, from a predominance
  of apatite to Al and Fe-associated P as well as organic P.\n*** invited b
 y the group of Environmental Geochemistry
DTSTART;TZID=Europe/Berlin:20160512T120000
DTEND;TZID=Europe/Berlin:20160512T133000
LOCATION:H6\, GEO
SUMMARY:Prof. Jon Petter Gustafsson\, Soil and Groundwater Chemistry\, KTH 
 Stockholm / SLU Uppsala (Homepage): Speciation and bioavailability of trac
 e metals and phosphorus in soil systems
TRANSP:TRANSPARENT
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